Comes from that Greek dude who had to keep pushing a boulder up a mountain for eternity as punishment for being a douche.
(Also what noobs who don't know how to use chopsticks at Chinese restaurants do trying to pick up those last few grains of rice but instead they are just rolling around the plate).
Idiot2: Yeah, he sure have some Romentum
There goes Lilo back in court.
Hot mess got Romentum.
Barney: I just talked to Betty the cheerleading captain yesterday. She loved my bug collection. I'm gonna ask her to prom
Steve: Yeah. You got some serious romentum.